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Amino-acid-modified chitosan flocculating agent and preparation method and application thereof

A technology of chitosan and amino acid, applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of large dosage, secondary pollution, high treatment cost, etc., achieve strong biocompatibility, avoid pollution, and have a wide range of sources Effect

Active Publication Date: 2016-05-25
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the disadvantages of existing flocculants (inorganic flocculants, synthetic organic polymers) such as large dosage, high treatment cost, and secondary pollution, the present invention provides an amino acid-modified fully degradable chitosan flocculant and a preparation method thereof And application, it is obtained by chemical reaction of amino acid and chitosan, the flocculant of the present invention has not only improved molecular weight, strengthened bridging flocculation, also can meet the requirement that residual flocculant does not have secondary pollution, and the amino acid function introduced The group contains an aromatic ring structure and has good flocculation ability for antibiotics in water

Method used

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  • Amino-acid-modified chitosan flocculating agent and preparation method and application thereof
  • Amino-acid-modified chitosan flocculating agent and preparation method and application thereof
  • Amino-acid-modified chitosan flocculating agent and preparation method and application thereof

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Effect test

Embodiment 1

[0045] The preparation method is as follows:

[0046] Dissolve chitosan (molecular weight 550,000, degree of deacetylation 75%) in 1% (mass fraction, the same below) hydrochloric acid (the mass ratio of chitosan to hydrochloric acid solution is 1:1.7), adjust the pH to 5, and stir until fully dissolved. Dissolve 4-dimethylaminopyridine and 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride in dimethylformamide, stir and mix well, then quickly pour into chitosan solution The mass ratio of (4-dimethylaminopyridine to chitosan is 1:2, the mass ratio of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride to chitosan is 1:3, the mass ratio of dimethylformamide and chitosan is 1:6), amino acid (tryptophan) is dissolved in 1% hydrochloric acid (the mass ratio of amino acid and hydrochloric acid solution is 1.5:1), Adjust the pH to 5 and stir until fully dissolved. Then the amino acid solution was added to the chitosan solution at a rate of 0.1 mL / s (the mass ratio...

Embodiment 2

[0050] The preparation method is as follows:

[0051] Dissolve chitosan (molecular weight 670,000, degree of deacetylation 70%) in 1.5% (mass fraction, the same below) hydrochloric acid (mass ratio of chitosan to hydrochloric acid solution is 1:2.6), adjust pH to 5, stir until fully dissolved. Dissolve 4-dimethylaminopyridine and 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride in dimethylformamide and stir until well mixed, then quickly pour into chitosan In the solution (the mass ratio of 4-dimethylaminopyridine and chitosan is 1:3, the mass of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride and chitosan The ratio is 1:5, and the mass ratio of dimethylformamide and chitosan is 1:7). Dissolve amino acid (tryptophan) in 1.5% hydrochloric acid (the mass ratio of amino acid to hydrochloric acid solution is 2.4:1), adjust the pH to 5, and stir until fully dissolved. Then the amino acid solution was added to the chitosan solution at a rate of 0.2 mL / s (th...

Embodiment 3

[0055] The preparation method is as follows:

[0056] Dissolve chitosan (molecular weight 780,000, degree of deacetylation 65%) in 3% hydrochloric acid (mass fraction, the same below) (mass ratio of chitosan to hydrochloric acid solution is 1:5.2), adjust pH to 6, stir until fully dissolved. Dissolve 4-dimethylaminopyridine and 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride in dimethylformamide and stir until well mixed, then quickly pour into chitosan The mass ratio of (4-dimethylaminopyridine and chitosan in the solution is 1:4, the mass of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride and chitosan The ratio is 1:5, and the mass ratio of dimethylformamide and chitosan is 1:7). Dissolve amino acid (tryptophan) in 3% hydrochloric acid (the mass ratio of amino acid to hydrochloric acid solution is 3.1:1), adjust the pH to 6, and stir until fully dissolved. Then the amino acid solution was added to the chitosan solution at a rate of 0.1 mL / s (the ma...

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Abstract

The invention discloses an amino-acid-modified chitosan flocculating agent and a preparation method and application thereof and belongs to the field of organic synthesis of high polymer materials. The flocculating agent is prepared from chitosan and amino acid through a chemical reaction, the amino acid is one of tryptophan or tyrosine or phenylalanine, the molecular weight of the chitosan is 110-840 thousand, and the deacetylation degree is 65-95%; the infrared spectrogram of the amino-acid-modified chitosan flocculating agent is provided with a characteristic absorption peak within the range of 1500-1520cm<-1>. By means of the flocculating agent, the molecular weight is increased, the bridging flocculation effect is enhanced, furthermore, the requirement that the residual flocculating agent causes no secondary pollution to a water body can be met, an introduced amino acid functional group contains an aromatic ring structure, and good flocculation capability is achieved for antibiotics in the water body.

Description

technical field [0001] The invention belongs to the field of organic synthesis of polymer materials, and more specifically relates to an amino acid modified chitosan flocculant and its preparation method and application. Background technique [0002] Water is the source of life, human survival, life and production cannot do without water. With the advancement of science and technology and the development of industrial production, antibiotics have been widely used in various poultry breeding, aquaculture, medical treatment and food processing, and the water pollution caused by antibiotics has become increasingly serious. [0003] In order to solve the problem of water pollution, a series of water treatment and purification technologies and processes have developed rapidly. Among them, flocculation is often used as the first step in water treatment, and it is also the most critical step. In this process, the choice of flocculant directly determines the quality of the floccul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/08C02F1/56
CPCC02F1/56C08B37/003
Inventor 杨朕马瑞雪于歌贾淑颖杨维本
Owner NANJING NORMAL UNIVERSITY
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